Display device having common electrode overlapping capacitor electrode and pixel electrode

Abstract

A display device includes a substrate, a first data line, a scan line, a first sub-pixel, a passivation layer, and a common electrode. The first sub-pixel includes a first main-driving element, a first sub-driving element, a first capacitor electrode, and a first pixel electrode. The first main-driving element includes a first main-gate, a first main-channel layer, a first main-source, and a first main-drain. The first sub-driving element includes a first sub-gate, a first sub-channel layer, a first sub-source, and a first sub-drain. The first capacitor electrode is electrically connected with the first main-drain and the first sub-source. The first pixel electrode is electrically connected with the first sub-drain. The common electrode and the first capacitor electrode have a first main capacitor therebetween. The common electrode and the first pixel electrode have a first sub capacitor therebetween.

What is claimed is: 
     
       1. A display device, comprising:
 a substrate; 
 a first data line and a scan line, located on the substrate; 
 a first sub-pixel, located on the substrate, wherein the first sub-pixel comprises a first main-driving element, a first sub-driving element, a first capacitor electrode and a first pixel electrode, wherein
 the first main-driving element comprises:
 a first main-gate, electrically connected with the scan line; 
 a first main-channel layer, overlapping with the first main-gate; and 
 a first main-source and a first main-drain, electrically connected with the first main-channel layer, wherein the first main-source is electrically connected with the first data line, and 
 
 the first sub-driving element comprises:
 a first sub-gate, electrically connected with the scan line; 
 a first sub-channel layer, overlapping with the first sub-gate; and 
 a first sub-source and a first sub-drain, electrically connected with the first sub-channel layer, wherein the first main-drain and the first sub-source are substantially connected as one piece, the first capacitor electrode is electrically connected to and in contact with the first main-drain and the first sub-source through a first through hole, and the first pixel electrode is electrically connected to and in contact with the first sub-drain through a second through hole; 
 
 
 a passivation layer, located on the first main-source, the first main-drain, the first sub-source and the first sub-drain, wherein the first capacitor electrode and the first pixel electrode are located on the passivation layer; and 
 a common electrode, overlapping with the first capacitor electrode and the first pixel electrode, wherein the common electrode and the first capacitor electrode have a first main capacitor therebetween, the common electrode and the first pixel electrode have a first sub capacitor therebetween, and a material of the first capacitor electrode, the first pixel electrode and the common electrode comprises a transparent conductive material. 
 
     
     
       2. The display device according to  claim 1 , wherein a part of the first capacitor electrode is parallel to the scan line. 
     
     
       3. The display device according to  claim 1 , wherein the first capacitor electrode and the first pixel electrode are located at one side of the scan line. 
     
     
       4. The display device according to  claim 1 , wherein the first capacitor electrode and the first pixel electrode are located at different sides of the scan line. 
     
     
       5. The display device according to  claim 1 , wherein a capacitance value of the first main capacitor is M1, a capacitance value of the first sub capacitor is S1, and 10% of S1<M1≤60% of S1. 
     
     
       6. The display device according to  claim 1 , further comprising:
 a second data line and a third data line, located on the substrate; 
 a second sub-pixel and a third sub-pixel, located on the substrate, wherein the second sub-pixel comprises:
 a second main-driving element and a second sub-driving element, wherein a second main-source of the second main-driving element is electrically connected with the second data line, and a second main-drain of the second main-driving element is electrically connected with a second sub-source of the second sub-driving element; 
 a second capacitor electrode, electrically connecting with the second main-drain and the second sub-source; 
 a second pixel electrode, electrically connected with the second sub-drain, wherein the common electrode and the second capacitor electrode have a second main capacitor therebetween, and the common electrode and the second pixel electrode have a second sub capacitor therebetween, and the third sub-pixel comprises: 
 
 a third main-driving element and a third sub-driving element, wherein a
 third main-source of the third main-driving element is electrically connected with the third data line, and a third main-drain of the third main-driving element is electrically connected with a third sub-source of the third sub-driving element; 
 a third capacitor electrode, electrically connected with the third main-drain and the third sub-source; and 
 a third pixel electrode, electrically connected with the third sub-drain, wherein the common electrode and the third capacitor electrode have a third main capacitor therebetween, the common electrode and the third pixel electrode have a third sub capacitor therebetween; a capacitance value of the first main capacitor is M1, a capacitance value of the second main capacitor is M2, a capacitance value of the third main capacitor is M3, and M1 is not equal to M2 nor to M3. 
 
 
     
     
       7. The display device according to  claim 6 , wherein the first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, the third sub-pixel is a blue sub-pixel, a capacitance value of the first sub capacitor is S  1 , a capacitance value of the second sub capacitor is S2, and a capacitance value of the third sub capacitor is S3, wherein
 12% of S1<M1≤50% of S1, 
 12% of S2<M2≤50% of S2, and 
 10% of S3<M3≤40% of S3. 
 
     
     
       8. The display device according to  claim 7 , wherein M3 is less than M1 and less than M2. 
     
     
       9. The display device according to  claim 6 , wherein the first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, the third sub-pixel a blue sub-pixel, a capacitance value of the first sub capacitor is S1, a capacitance value of the second sub capacitor is S2, and a capacitance value of the third sub capacitor is S3, wherein
 10% of S1<M1≤50% of S1, 
 12% of S2<M2≤60% of S2, and 
 10% of S3<M3≤50% of S3. 
 
     
     
       10. The display device according to  claim 9 , wherein M2 is greater than M1 and greater than M3. 
     
     
       11. The display device according to  claim 6 , wherein a capacitance value of the first sub capacitor is S1, a capacitance value of the second sub capacitor is S2, a capacitance value of the third sub capacitor is S3, and S1=S2=S3. 
     
     
       12. The display device according to  claim 6 , further comprising:
 a gate driving circuit, electrically connected with the scan line, wherein the first main-driving element is closer to the gate driving circuit than the second main-driving element, and M1 is greater than M2. 
 
     
     
       13. The display device according to  claim 1 , wherein the first capacitor electrode and the first pixel electrode belong to different layers. 
     
     
       14. The display device according to  claim 13 , further comprising:
 a first dielectric material layer, located on the first capacitor electrode, and the common electrode being located on the first dielectric material layer; and 
 a second dielectric material layer, located on the common electrode, and the first pixel electrode being located on the second dielectric material layer. 
 
     
     
       15. The display device according to  claim 13 , wherein the first capacitor electrode and the first pixel electrode overlap with each other in a direction perpendicular to the substrate. 
     
     
       16. The display device according to  claim 1 , wherein the first capacitor electrode and the first pixel electrode belong to the same layer. 
     
     
       17. The display device according to  claim 16 , further comprising:
 a black matrix, located above the substrate, wherein the black matrix overlaps with the scan line and the first capacitor electrode in a direction perpendicular to the substrate. 
 
     
     
       18. The display device according to  claim 1 , wherein the first through hole and the second through hole penetrate the passivation layer, and the first through hole and the second through hole are arranged along an extension direction of the scan line.